Final report of the key comparison CCQM-K98: Pb isotope amount ratios in bronze

Published

July 1, 2014

Author(s)

Jochen Vogl, Yong-Hyeon Yim, Kyoung-Seok Lee, Heidi Goenaga-Infante, Dmitriy Malinowskiy, Tongxiang Ren, Jun Wang, Robert D. Vocke Jr., Karen E. Murphy, Naoko Nonose, Olaf Rienitz, Janine Noordmann, Teemu Naeykki, Timo Sara-Aho, Bet¿l Ari, Oktay Cankur

Abstract

Isotope amount ratios are proving useful in an ever increasing array of applications that range from studies unravelling transport processes, to pinpointing the provenance of specific samples as well as trace element quantification by using isotope dilution mass spectrometry (IDMS). These expanding applications encompass fields as diverse as archaeology, food chemistry, forensic science, geochemistry, medicine and metrology. However, to be effective tools, the isotope ratio data must be reliable and traceable to enable the comparability of measurement results. The importance of traceability and comparability in isotope ratio analysis has already been recognized by the Inorganic Analysis Working Group (IAWG) within the CCQM. While the requirements for isotope ratio accuracy and precision in the case of IDMS are generally quite modest, 'absolute' Pb isotope ratio measurements for geochemical applications as well as forensic provenance studies require Pb isotope ratio measurements of the highest quality. To support present and future CMCs on isotope ratio determinations, a key comparison was urgently needed and therefore initiated at the IAWG meeting in Paris in April 2011. The analytical task within such a comparison was decided to be the measurement of Pb isotope amount ratios in water and bronze. Measuring Pb isotope amount ratios in an aqueous Pb solution tested the ability of analysts to correct for any instrumental effects on the measured ratios, while the measurement of Pb isotope amount ratios in a metal matrix sample provided a real world test of the whole chemical and instrumental procedure. A suitable bronze material with a Pb mass fraction between 10 and 100 mg•kg-1 and a high purity solution of Pb with a mass fraction of approximately 100 mg•kg-1 was available at the pilot laboratory (BAM), both offering a natural-like Pb isotopic composition.

Citation

Metrologia

Pub Type

Journals

Keywords

Absolute Pb Isotope Amount Ratios, CCQM Key Comparison, CCQM, K98

Citation

Vogl, J. , Yim, Y. , Lee, K. , Goenaga-Infante, H. , Malinowskiy, D. , Ren, T. , Wang, J. , Vocke Jr., R. , Murphy, K. , Nonose, N. , Rienitz, O. , Noordmann, J. , Naeykki, T. , Sara-Aho, T. , Ari, B. and Cankur, O. (2014), Final report of the key comparison CCQM-K98: Pb isotope amount ratios in bronze, Metrologia (Accessed April 24, 2024)